The gender-neutral term for a niece or nephew (by analogy with sibling).
Nephlings are the delightful creatures you can adore and play with and who look up to you, but whose diapers you don't have to change and whose tantrums are
not your problem. The warm
feeling you get from seeing your nephlings is
unconscious gratification that your genes are being passed on (indirectly) to the next generation, without any effort of your own.